Different levels and phenomena of out-of-tolerance

In the process of using the quantitative packaging scale to package finished products, one of the problems that occurs more frequently is the phenomenon of excess tolerance. Not only are there many causes of excess tolerance, but the same quantitative packaging scale may also have different levels and different phenomena. difference. If each bag is out of tolerance, and the tolerance is very serious, you must first observe the large material door, small material door or scale hopper door, it must be an abnormal phenomenon in this one, and the closed one is not closed. In other words, if the quantitative packaging scale starts feeding, one of the large and small material doors or the weighing hopper door is always open, which will cause an over-tolerance phenomenon. After careful inspection, it can be found that the solenoid valve of the corresponding material door is always charged. After analysis, it is confirmed that the phenomenon occurs because the output relay in the quantitative packaging scale PLC is stuck due to high frequency use, which can not be broken. open. To solve this problem, just change the output of a PLC and change its corresponding program. If during the packing process of the quantitative packing scale, the out-of-tolerance phenomenon occurs only occasionally for several consecutive bags, and the out-of-tolerance value is not large, it means that the large-scale material door does not move smoothly during the closing process, and the phenomenon of instantaneous stuck. Due to the fast flow rate of the finished product, instantaneous stagnation will cause a large number of finished products to fall into the weighing hopper, resulting in excess tolerance. The reason why the quantitative packing into the large material door is stuck when it is closed is because a large amount of dust is attached to the large material door, and the dust between the large material door and the discharge port and the large material door and the small material door is reduced after the dust is scaled. Space, which causes the movement of the large door is not smooth. At this time, it is necessary to clean up the dust and scale with hot water, and the problem is naturally solved. There is also a case where the package weight cannot be stabilized in a small range, and occasionally excessive. After discovering the problem, you should first check the boom on the hopper of the quantitative packaging scale to see if it is loose. In addition, check the sensor's wiring board to see if there is a phenomenon of false soldering or desoldering on the circuit board. These are the reasons that may cause out of tolerance.